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Twenty-five years of natural coordinates

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Abstract

In the early eighties, the author and co-workers created and further developed the natural coordinates to describe the motion of 2-D and 3-D multibody systems. Natural coordinates do not need angles or angular parameters to define orientation, leading to constant inertia matrices and to the simplest form of the constraint equations. Natural coordinates are composed by the Cartesian coordinates of some points and the Cartesian components of some unit vectors distributed on the different bodies of the system. The points and vectors can be located in the joints, being shared by contiguous bodies, decreasing or even eliminating the need to set joint constraints and reducing the total number of variables. However, other authors prefer not to share variables in order to get even simpler equations and to keep a bigger decoupling of equations, which is preferable in some cases.

In this paper the history of natural coordinates is reviewed, as well as the main contributions coming from other research groups. In the second part of the paper some application areas in which natural coordinates can be particularly advantageous are examined.

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Authors and Affiliations

  1. INSIA y Departamento de Matemática Aplicada a la Ingeniería Industrial, Escuela Técnica Superior de Ingenieros Industriales (Universidad Politécnica de Madrid), José Gutiérrez Abascal 2, 28006, Madrid, Spain

    Javier García de Jalón

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  1. Javier García de Jalón
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Correspondence to Javier García de Jalón.

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de Jalón, J.G. Twenty-five years of natural coordinates. Multibody Syst Dyn 18, 15–33 (2007). https://doi.org/10.1007/s11044-007-9068-0

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